为了提高SUZ-4分子筛的Si/Al比,以(NH4)2SiF6(AHFS)为脱铝剂对HK-SUZ-4分子筛脱铝进行研究.采用XRD、MAS-NMR、FT-IR、EDS和N2吸附等技术手段对脱铝的SUZ-4进行表征.结果表明,HK-SUZ-4分子筛经(NH4)2SiF6(AHFS)脱铝后Si/Al比升高,而且SUZ-4脱铝程度随着AHFS浓度的升高而增大.脱铝前后的SUZ-4分子筛表面酸中心以B酸为主.随着脱铝程度升高,SUZ-4分子筛表面B酸中心量和总酸量均逐渐减少,甲醇脱水活性降低. In order to improve the Si / Al ratio of SUZ-4 molecular sieve, the dealumination of HK-SUZ-4 molecular sieve was studied by using (NH4) 2SiF6 (AHFS) as the dealuminizing agent.The XRD, MAS-NMR, FT-IR, EDS and N2 Adsorption and other techniques were used to characterize the dealuminated SUZ-4. The results showed that the Si / Al ratio of HK-SUZ-4 molecular sieve after dealumination by (NH4) 2SiF6 (AHFS) was increased, and the dealumination degree of SUZ- AHFS concentration of SUZ-4 zeolites before and after dealumination was mainly Bromic acid on SUZ-4 molecular sieve surface. With the degree of dealumination increasing, the content of Brønsted acid and total acid of SUZ-4 zeolites gradually decreased, Methanol dehydration activity decreased.